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Witch Doctor Mau'ari used to collect E'ko, and give various buffs in exchange for them. Since the

Cataclysm, these rarely drop. They can't be turned in or vendored. They are auctionable for those with no scruples who want to sell worthless items to the unwitting, though. The buffs are now applied randomly when killing the relevant mobs. Obtaining one of each buff completes the E'ko Madness achievement.

E'ko buffs and mob sources Edit

Info from "Ek'o Madness" comments at Wowhead.

[Juju Frenzy] - from any Winterfall Furbolg in Winterspring (68,50 East of Everlook).
[Juju Mending] - from Shard Tooth Maulers (Brown Bear) (59,40 around Moon Horror Den).
[Juju Fury] - from Shy-Rotam (Frostsaber Cat) (47,19 Frostsaber Cave).
[Juju Chill] - from Icewhomp (Yetis) inside the Cave (67,54 South East of Everlook).
[Juju Instinct] - from Owl Beasts (64,28 Hidden Cave).
[Juju Brawn] - from Frostmaul Giants (65,69 near Frostwhisper Gorge).
[Juju Freeze] - from Chilled Chimera (56,28 Approx).

Old types of E'ko Edit

For historical purposes only.

Quest	E'ko Type	Need to Defeat	Buffing Item
Chillwind E'ko	[Chillwind E'ko]	Chillwind Chimaeras	[Juju Chill]
Frostmaul E'ko	[Frostmaul E'ko]	Frostmaul Giants	[Juju Might]
Frostsaber E'ko	[Frostsaber E'ko]	Frostsaber Cats	[Juju Flurry]
Ice Thistle E'ko	[Ice Thistle E'ko]	Ice Thistle Yetis	[Juju Escape]
Shardtooth E'ko	[Shardtooth E'ko]	Shardtooth Bears	[Juju Ember]
Wildkin E'ko	[Wildkin E'ko]	Winterspring Owlbeasts	[Juju Guile]
Winterfall E'ko	[Winterfall E'ko]	Winterfall Furbolgs	[Juju Power]